Improvement in machine for cutting bead-mitres



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ROBERT F. TOM'PKINS, OF NEW YORK, N. Ya'

Letters Patent No. 92,491, dated July 13, V1869.

IMPROVEMENT IN MACHINE FOR CUTTING BEAD-MITRES.

The Schedule referred to in these Letters Patent and making part of thesameA To all whom it 'ma/y concern Be it known that I, ROBERT F.ToMrmNs, of the city, county, and State of New York, have invented aMachine for Cutting Bead-Mitres; and that the following description,taken in 'connection with the accompanying drawings, hereinafter.referred to, forms a full and exact specification of the same, wherein Ihavel set forth the nature and principles of my said limprovement, bywhich my invention may be distinshutters, blinds, doors&c.,where abeading runs along the edges of the wood used for the purpose, it isnecessary,'in order to give a nished appearance to the work, that thebeading should come together with a mitre; and to do this expeditiouslyand neatly not only requires a skilled workman, but considerable time.

By ,the use of my invention, however, vthis work may be done accuratelyand expeditiously by one of little skill, or even by a boy. A

In the accompanying drawings- Figure 1 represents afront side view;

Figure 2, a. rear side View of the same; and

Figure 3, a plan,l or top of my invention.

Similar letters of reference indicate like parts in the severaldrawings.

A is the bed-plate, upon. which the machine is Vproperly secured.

This bed-plate-'may beconstruct'ed of wood or castiron. I prefer to makeit of wood, as itis both cheaper and lighter. 1 l

B is an upright castiron frame, standing at right angles to thebedfplate A, to which it is secured by the plates a a', cast in onepiece with the frame B,

-and let into` the bed-plate A, flush with its upper surface.

The plates a a are irmly secured to the bed-plate A by the screws b b,with countersunk heads.

Sliding freely up and down on the rods or guides c c, is the cast-ironblock (l, to which is bolted, or otherwise attached, the knife, orcutter D, by the tongue e.

-This knife, or cutter D may be made of cast-steel or of wrought-iron,with steel cutting-edges.

In the shape and construction of this knife, or cutter, lies the chiefmerit of my invention.

It will b e observed that this knife, or cutter has three distinctcutting-edges combined in one, viz, the project ing, or front' edge f,which is parallel with the upper surface of the bed-plate A, and thecutting-edges g g,

formed at angles offortyfive degrees with the front edge f. y

By reason of the peculiar shape of the knife, or cutter D, it will beobserved that when a strip of moulding, or wood having a bead alongI itsedge, is placed under the knife or cutter, with the beaded edge pressedclosely against the fences It h, and the knife or cutter D is forcedthrough the wood by the lever K, the edge fwill cut the moulding -orstrip in a direction parallel with its length, whivle the edge g will,at the v same time, neatly cut the beading on the edge of the strip'toan angle of forty-tive degrees, or mit-re; and this operation may berepeated as often as maybe required, depending upon the length ofmortise, or otherwise, as the workman may see tit.

If, at any time, the knife or lcutter D requires y l sharpening, it maybe readily detached from the machine by simply loosening the setfscrewi, and then sharpening it the same as any other tool or iron would besharpened.

The knife or cutter D is confined to its position by sliding between theprojecting edges of the guideplates l Z, and the frame B.

The play of the knife between these guide-plates and frame mayberegulated by the set-screwsw 'ua As the, size of headings vary, Iaccommodate the action of the machine to thevarious sizes by means ofthe fences h h, which are projected to the front, thus exposing lesscutting-surface of the knife where the beading is small, and ricefrersa.

The ends of these fences next the knife or cutter are so constructed asto move always parallel with the edges g g. v

This is accomplished by means of the angular guides or slides m lm., andset-screws u n.

rlhc plates c a, besidesv securing the frame l5 to the `bed-plate A,answer the double purpose of keeping the bed-plate from wearing away atthe cuttingpoint, andthus keeping the surface of the bed-plate exactlyat right angles to the edges of the knife or cutter D.

As the moulding or strip may, in some instances, be thinner than atothers, I regulate the throw of the knife by the screw p, which, whenscrewed inward,

shortens the .slot r, and thus leaves less play for the pin s, as isclearly shown in iig. 2.

, The bed-plate A has a depression, t, corresponding in shape and -sizewith the knife or cutter D, into which the knife or cutter is forcedwhen passing through the moulding and bead, thus insuring a' clean cut,without burr. l

The lower ends of the rods .or guides c care fitted into the cross-barj, which is cast into .the frame, and the upper ends pass throughtheupper part of the frame, nuts o o.

where they are secured by the I am aware of the patent granted to G. W.La. Baw,

dated 29th Mey, 1855, and I hereby disclaim his in` vention.

Having thus fully described nay-invention,

What I claim as new, and desire tosecure by Letters Patent, is

The knife or cutter D, adjustable fences hh, with the angular guides orslides 'm m,'fra.me B, guideplates ll, when all -are constructed andarranged to operate for the purposes hereinbefore set forth anddescribed.

ROBERT F. TOMPKINS` Witnesses:

H. L. WATTENBERG, G. M. PLYMPTON.

